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Vulnerability record · CVE-2023-26487 · published 4 March 2023

CVE-2023-26487: Vega-functions project vega-functions cross-site scripting vulnerability

VVega Functions Project · Vega Functions

Vega is a visualization grammar, a declarative format for creating, saving, and sharing interactive visualization designs.`lassoAppend' function accepts 3 arguments and internally invokes `push` function on the 1st argument specifying array consisting of 2nd and 3rd arguments as `push` call argument. The type of the 1st argument is supposed to be an array, but it's not enforced. This makes it possible to specify any object with a `push` function as the 1st argument, `push` function can be set to any function that can be access via `event.view` (no all such functions can be exploited due to invalid context or signature, but some can, e.g. `console.log`). The issue is that`lassoAppend` doesn't enforce proper types of its arguments. This issue opens various XSS vectors, but exact impact and severity depends on the environment (e.g. Core JS `setImmediate` polyfill basically allows `eval`-like functionality). This issue was patched in 5.23.0.

6.1 CVSS 3.1 Medium EPSS 0.81% · top 44.9% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score
0.81%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Vega is a visualization grammar, a declarative format for creating, saving, and sharing interactive visualization designs.`lassoAppend' function accepts 3 arguments and internally invokes `push` function on the 1st argument specifying array consisting of 2nd and 3rd arguments as `push` call argument. The type of the 1st argument is supposed to be an array, but it's not enforced. This makes it possible to specify any object with a `push` function as the 1st argument, `push` function can be set to any function that can be access via `event.view` (no all such functions can be exploited due to invalid context or signature, but some can, e.g. `console.log`). The issue is that`lassoAppend` doesn't enforce proper types of its arguments. This issue opens various XSS vectors, but exact impact and severity depends on the environment (e.g. Core JS `setImmediate` polyfill basically allows `eval`-like functionality). This issue was patched in 5.23.0.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/vega/vega/commit/01adb034f24727d3bb321bbbb6696a7f4cd91689 Patch
https://github.com/vega/vega/releases/tag/v5.23.0 Release Notes
https://github.com/vega/vega/security/advisories/GHSA-w5m3-xh75-mp55 ExploitThird Party Advisory
https://github.com/vega/vega/commit/01adb034f24727d3bb321bbbb6696a7f4cd91689 Patch
https://github.com/vega/vega/releases/tag/v5.23.0 Release Notes
https://github.com/vega/vega/security/advisories/GHSA-w5m3-xh75-mp55 ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2023-26487), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.